Vegetarianism

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There have been very few human societies in which meat or fish are not eaten, although in some parts of the world normal diet is made up largely of staple foods such as rice, with meat and fish being relatively rare additions; this has often been due to poverty rather than choice. In modern Western societies, however,'voluntary' vegetarianism is on the increase. Should we stop eating other animals? What are the moral, environmental, and health issues involved?